Ivey has dozens upon dozens of leglock victories, and is able to execute rolling kneebars despite his weight. He was probably attempting one but quickly realized he fouled up, so he played it off with some theatrics. He often brings his sense of humor into fights, just watch:

"Boxing is the art of hitting an opponent from the furthest distance away, exposing the least amount of your body while getting into position to punch with maximum leverage and not getting hit."
Kenny Weldon

Ivey has dozens upon dozens of leglock victories, and is able to execute rolling kneebars despite his weight. He was probably attempting one but quickly realized he fouled up, so he played it off with some theatrics. He often brings his sense of humor into fights, just watch:

I was gonna suggest it's a reverse kaiten geri, but you had to go and bring facts into it.